Abstract: The invention relates to a cable saw device (1) comprising a sawing cable (25) and a cable storage device (30) which is used for temporary accommodation of the sawing cable (25). The cable storage device (30) comprises several deflection rollers (5,6). At least two of said deflection rollers (5,6) are placed at a modifiable axial distance (A) from each other. The cable saw (25) is driven by several deflection rollers (5). Means for compensating the different speeds of the cable saw (25) are arranged between the driving deflection rollers (5).

Abstract: To prevent overloading of a clutch interposed between a driving, or input shaft (2, 112) and a driven, or output shaft (4, 115) upon blockage of the output shaft while continuous rotary power is being transmitted to the input shaft, a plurality of centrifugal weights (16, 117) are located on an output clutch member (14, 116) so that, in case of blockage of the output shaft, centrifugal force will immediately cease and power transmitting engagement between the input and output shafts will be disconnected. In order to permit starting of the clutch, a predetermined small frictional force between an input clutch member (6, 114) coupled to the driving or input shaft (2, 112) and the output clutch member (14, 116) is established, essentially independent of speed, for example under control of springs (22).

Abstract: A pulley block is provided for rope storage to receive reserve cable or rope in a rope saw machine (3). The saw rope (1) is slung around the deflecting rollers of a stationary roller carrier and of a movable roller carrier (5,6) mounted on a frame (4). Two hydraulic motors drive the saw rope (1). A chain hoist (9) driven by a motor (10) moves the vertically ajustable roller carrier (6). By winding the saw rope (1) in different ways over additional rollers (22, 24, 26) various rope storage capacities are obtained. This design allows the free rope loop to be stored in a particularly space-saving manner.

Abstract: The connection between a residential junction pipe or the like and a sewer pipe is repaired by a cutter head that is led into the junction pipe and operates essentially with its front face. Thereby, it is unnecessary to locate junction pipes in a replaced sewer pipe as is the case with known methods. The cutter head is fastened at the front end of a flexible shaft. A feeding device feeds the cutter head during cutting. A fastening mechanism centers the device in the pipe to be worked. The cutter head includes an eccentric head rotatable about the center axis of the pipe and a cutter wheel that is rotatably supported in the eccentric head that moves in a circular orbit in the pipe. The fastening mechanism includes three radially adjustable supporting elements and a hydraulic piston-cylinder unit pressing the supporting elements against an inner wall of the pipe. After fastening of the supporting elements, the cutter head is moved by the feeding device in the pipe to achieve cutting.

Abstract: To permit at least partial disassembly of a drive motor (2) from a coupled pump system (3) to provide high hydraulic pressure, and separate portability of the motor element and the pump element, a cart, with wheels (4), is provided with a horizontally transversely extending mounting plate (28) on which the motor (22) can seat, with its motor shaft (27) extending vertically. The pump unit (3), which can be formed of two or more high-pressure hydraulic pumps and include a cooling water circulating pump (14), has a vertically extending pump shaft (56). The motor shaft and the pump shaft extend through the mounting plate, and a transmission, preferably a belt transmission, is located below the mounting plate. The belt transmission may include a drive pulley which is hollow in the middle, and formed with an internal gear (33) which engages an external, axially curved gear (14') on the motor drive shaft, to form a separable coupling. The motor can be lifted off the cart, and transported separately.

Abstract: A rotary cutter saw apparatus (C, B) is movable along an elongated rail element (1). To permit continuous selected longitudinal adjustment of support blocks (8, 34) with respect to a base support suface (S) along the length of elongated rail element (1), an attachment base is formed on the rail element which interfits with a projection-and-recess fit with a portion of the support block. A clamping arrangement (7) can clamp the interengaging projection-and-recess portions together; preferably, they form a dovetail connection, with a movable clamping jaw which clamps both against the attachment base and the support block structure. The support block may include a plate (10), adjustably positioned over the surface by adjustment screw bolts, or a rod or tube element (35), so that the rail element (1) and the cutter element thereon, can also be tilted about the axis of the rod or tube element.

Abstract: Recessed grooves are cut into bore hole walls of concrete or rock materials for the purpose of interconnecting two components of such materials at an interface between these components. These recessed grooves are cut by material removing tools which can be pressed radially outwardly, while a drive shaft simultaneously rotates these tools. For this purpose, an axial movement of an adjustment body is converted into a tilting movement of pivotable shafts which carry the material removable tools, whereby the adjustment body is moved linearly by a hydraulic lifting device. The material removing tools extend radially away from the lower ends of the pivotable shaft. The common adjustment movement of all of the pivotable shafts takes place independently of the rotation of the driven shaft.

Abstract: The valve, preferably a dual control valve suitable for high pressure use, has a housing (2) formed with parallel bores in which rotatable valve elements (3,4) are located. The rotatable valve elements are each formed with a blind bore (22,23) coaxial therewith, and defining between an outer surface of the valve element and the blind bore a valve sleeve which communicates via lateral cut-outs (38,39) with inlets (11,12) to the blind bores. Valve sleeve portions (47,46) are left adjacent the cut-outs. The valve housing (2) is formed with outlet openings which can be exposed upon rotation of the valve elements to the remaining valve sleeve portions or to the cut-outs, respectively, to provide, selectively, CLOSED or OPEN positions of the respective valve elements. The housing and the valve elements are made of metal, the valve elements being fitted in the bore with slight amount of play.

Abstract: To provide a portable demolition apparatus for concrete slabs, plates or the like, a clamping arch (1) having two end portions (12, 13) is equipped with pointed bolts (15, 16; 17, 18) at the ends; at least one (16, 18) of the pointed bolts is coupled to a cylinder-piston arrangement (21) which, upon application of high hydraulic pressure in the order of for example 800 bar, drives the pointed bolt towards the other, thus cracking the concrete plate, slab or the like between the points. Hydraulic pressure is obtained from a separately located pressure source, which permits construction of the arch of lightweight material, with an overall weight of 50 kg or less, with a jaw clearance opening of 45 cm or less, application of hydraulic force being controlled by a pilot valve-control slider arrangement (23, 24) located directly on the clamping arch and coupled to the remotely located pressure source by suitable pressure hoses.

Abstract: To permit easy coupling and uncoupling of a concrete or rock circular boring or milling tool element (14, 17), two coupling parts (1, 2) are provided, a first coupling part (1) being formed with a recess (7) of non-circular cross-sectional shape, for example of approximate four-leaf clover shape, extending inwardly from an end face (11) of the first part; the second part (2) has a projection (20) of non-circular cross-sectional shape, matching the cross-sectional shape of the recess, and fitting therein, while being axially separable therefrom. The engagement surfaces (a, 22) of the respective first and second parts extend axially of the coupling elements. A retaining nut (3) retains the parts against each other.

Abstract: An instantaneous desired cutting position of a milling cutter or circular saw blade in a mobile apparatus for cutting hard materials, such as a concrete highway surface, is maintained even if the mobile apparatus travels over irregular or slanted surfaces. For this purpose the saw blade position is adjustable either by varying the position of the saw blade mounting in a machine frame or by varying the position of the entire machine frame. The position correction is accomplished by a sensor which produces control signals for a position correction power drive in response to pendulum movements which represent cutter or blade deviations from the desired cutting position. The position of the entire machine frame may be varied by raising or lowering a wheel remote from the cutter or blade. Thus, a binding or jamming of the cutter or blade is prevented.

Abstract: A concrete cutting or milling apparatus has a milling head carrying a power driven circular saw blade or milling cutter movable along a guide rail having a plurality of guide rail sections that may be coupled to each other in the longitudinal direction. The guide rail sections are supported by a foot structure that can be screwed to a concrete member, such as a wall or floor, to be cut. The foot structure is releasably secured to the guide rails however in a torsion stiff manner. Further, the foot structure is provided with adjustment screws for the proper axial alignment of the guide rail sections relative to each other to provide for a correction of the rail position and for compensating an uneveness in the surface of the concrete member to be cut. The structure is lightweight and one operator can secure the rail sections to a concrete surface. The rail sections form a closed cross-sectional tubular shape which may be round or substantially box shaped.